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Sommer, Liesel ; Schumacher, Liesel: An unfitted discontinuous Galerkin scheme for a phase-field approximation of pressurized fractures. 2019
Inhalt
Introduction
Preliminaries
Basic notation
Pressurized fractures
Energy formulation
Bulk energy
Surface energy
Phase-field formulation
Gamma-convergence
Functions of bounded variation and bounded deformation
Measure theory
Bounded variation
Bounded deformation
Discretization methods
Finite element methods
Discontinuous Galerkin methods
Unfitted discontinuous Galerkin methods
Gamma-convergence of the energy functional
One-dimensional case
Higher dimensions
Convergence of minimizers
Numerical methods
Discretization
DG discretization of the displacement equation
TNNMG discretization of the phase-field equation
Adjustments for UDG
Reconstruction of the crack
Implementation
Distributed and Unified Numerics Environment (DUNE)
Construction of the skeleton
Creation of sub-domains
Numerical experiments
Pure mode I loading
Constant pressure
Two cracks joining
Summary and outlook
Bibliography